content: /* ===========================================================
   * JFreeChart : a free chart library for the Java(tm) platform
   * ===========================================================
   *
   * (C) Copyright 2000-2012, by Object Refinery Limited and Contributors.
   *
   * Project Info:  http://www.jfree.org/jfreechart/index.html
   *
   * This library is free software; you can redistribute it and/or modify it
   * under the terms of the GNU Lesser General Public License as published by
   * the Free Software Foundation; either version 2.1 of the License, or
   * (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
   * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
   * License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
   * USA.
   *
   * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
   * Other names may be trademarks of their respective owners.]
   *
   * ------------------
   * XYBarRenderer.java
   * ------------------
   * (C) Copyright 2001-2012, by Object Refinery Limited.
   *
   * Original Author:  David Gilbert (for Object Refinery Limited);
   * Contributor(s):   Richard Atkinson;
   *                   Christian W. Zuckschwerdt;
   *                   Bill Kelemen;
   *                   Marc van Glabbeek (bug 1775452);
   *                   Richard West, Advanced Micro Devices, Inc.;
   *
   * Changes
   * -------
   * 13-Dec-2001 : Version 1, makes VerticalXYBarPlot class redundant (DG);
   * 23-Jan-2002 : Added DrawInfo parameter to drawItem() method (DG);
   * 09-Apr-2002 : Removed the translated zero from the drawItem method. Override
   *               the initialise() method to calculate it (DG);
   * 24-May-2002 : Incorporated tooltips into chart entities (DG);
   * 25-Jun-2002 : Removed redundant import (DG);
   * 05-Aug-2002 : Small modification to drawItem method to support URLs for HTML
   *               image maps (RA);
   * 25-Mar-2003 : Implemented Serializable (DG);
   * 01-May-2003 : Modified drawItem() method signature (DG);
   * 30-Jul-2003 : Modified entity constructor (CZ);
   * 20-Aug-2003 : Implemented Cloneable and PublicCloneable (DG);
   * 24-Aug-2003 : Added null checks in drawItem (BK);
   * 16-Sep-2003 : Changed ChartRenderingInfo --> PlotRenderingInfo (DG);
   * 07-Oct-2003 : Added renderer state (DG);
   * 05-Dec-2003 : Changed call to obtain outline paint (DG);
   * 10-Feb-2004 : Added state class, updated drawItem() method to make
   *               cut-and-paste overriding easier, and replaced property change
   *               with RendererChangeEvent (DG);
   * 25-Feb-2004 : Replaced CrosshairInfo with CrosshairState (DG);
   * 26-Apr-2004 : Added gradient paint transformer (DG);
   * 19-May-2004 : Fixed bug (879709) with bar zero value for secondary axis (DG);
   * 15-Jul-2004 : Switched getX() with getXValue() and getY() with
   *               getYValue() (DG);
   * 01-Sep-2004 : Added a flag to control whether or not the bar outlines are
   *               drawn (DG);
   * 03-Sep-2004 : Added option to use y-interval from dataset to determine the
   *               length of the bars (DG);
   * 08-Sep-2004 : Added equals() method and updated clone() method (DG);
   * 26-Jan-2005 : Added override for getLegendItem() method (DG);
   * 20-Apr-2005 : Use generators for label tooltips and URLs (DG);
   * 19-May-2005 : Added minimal item label implementation - needs improving (DG);
   * 14-Oct-2005 : Fixed rendering problem with inverted axes (DG);
   * ------------- JFREECHART 1.0.x ---------------------------------------------
   * 21-Jun-2006 : Improved item label handling - see bug 1501768 (DG);
   * 24-Aug-2006 : Added crosshair support (DG);
   * 13-Dec-2006 : Updated getLegendItems() to return gradient paint
   *               transformer (DG);
   * 02-Feb-2007 : Changed setUseYInterval() to only notify when the flag
   *               changes (DG);
   * 06-Feb-2007 : Fixed bug 1086307, crosshairs with multiple axes (DG);
   * 09-Feb-2007 : Updated getLegendItem() to observe drawBarOutline flag (DG);
   * 05-Mar-2007 : Applied patch 1671126 by Sergei Ivanov, to fix rendering with
   *               LogarithmicAxis (DG);
   * 20-Apr-2007 : Updated getLegendItem() for renderer change (DG);
   * 17-May-2007 : Set datasetIndex and seriesIndex in getLegendItem() (DG);
   * 18-May-2007 : Set dataset and seriesKey for LegendItem (DG);
   * 15-Jun-2007 : Changed default for drawBarOutline to false (DG);
   * 26-Sep-2007 : Fixed bug 1775452, problem with bar margins for inverted
   *               axes, thanks to Marc van Glabbeek (DG);
   * 12-Nov-2007 : Fixed NPE in drawItemLabel() method, thanks to Richard West
   *               (see patch 1827829) (DG);
   * 17-Jun-2008 : Apply legend font and paint attributes (DG);
   * 19-Jun-2008 : Added findRangeBounds() method override to fix bug in default
   *               axis range (DG);
   * 24-Jun-2008 : Added new barPainter mechanism (DG);
   * 03-Feb-2009 : Added defaultShadowsVisible flag (DG);
   * 05-Feb-2009 : Added barAlignmentFactor (DG);
   * 10-May-2012 : Fix findDomainBounds() and findRangeBounds() to account for
   *               non-visible series (DG);
   * 16-Jun-2012 : Removed JCommon dependencies (DG);
   *
   */
  
  package org.jfree.chart.renderer.xy;
  
  import java.awt.Font;
  import java.awt.Graphics2D;
  import java.awt.Paint;
  import java.awt.Shape;
  import java.awt.Stroke;
  import java.awt.geom.Point2D;
  import java.awt.geom.Rectangle2D;
  import java.io.Serializable;
  
  import org.jfree.chart.LegendItem;
  import org.jfree.chart.axis.ValueAxis;
  import org.jfree.chart.ui.GradientPaintTransformer;
  import org.jfree.chart.ui.RectangleEdge;
  import org.jfree.chart.ui.StandardGradientPaintTransformer;
  import org.jfree.chart.util.ObjectUtilities;
  import org.jfree.chart.util.PublicCloneable;
  import org.jfree.chart.entity.EntityCollection;
  import org.jfree.chart.event.RendererChangeEvent;
  import org.jfree.chart.labels.ItemLabelAnchor;
  import org.jfree.chart.labels.ItemLabelPosition;
  import org.jfree.chart.labels.XYItemLabelGenerator;
  import org.jfree.chart.labels.XYSeriesLabelGenerator;
  import org.jfree.chart.plot.CrosshairState;
  import org.jfree.chart.plot.PlotOrientation;
  import org.jfree.chart.plot.PlotRenderingInfo;
  import org.jfree.chart.plot.XYPlot;
  import org.jfree.chart.text.TextUtilities;
  import org.jfree.data.Range;
  import org.jfree.data.xy.IntervalXYDataset;
  import org.jfree.data.xy.XYDataset;
  
  /**
   * A renderer that draws bars on an {@link XYPlot} (requires an
   * {@link IntervalXYDataset}).  The example shown here is generated by the
   * <code>XYBarChartDemo1.java</code> program included in the JFreeChart
   * demo collection:
   * <br><br>
   * <img src="../../../../../images/XYBarRendererSample.png"
   * alt="XYBarRendererSample.png" />
   */
  public class XYBarRenderer extends AbstractXYItemRenderer
          implements XYItemRenderer, Cloneable, PublicCloneable, Serializable {
  
      /** For serialization. */
      private static final long serialVersionUID = 770559577251370036L;
  
      /**
       * The default bar painter assigned to each new instance of this renderer.
       *
       * @since 1.0.11
       */
      private static XYBarPainter defaultBarPainter = new GradientXYBarPainter();
  
      /**
       * Returns the default bar painter.
       *
       * @return The default bar painter.
       *
       * @since 1.0.11
       */
      public static XYBarPainter getDefaultBarPainter() {
          return XYBarRenderer.defaultBarPainter;
      }
  
      /**
       * Sets the default bar painter.
       *
       * @param painter  the painter (<code>null</code> not permitted).
       *
       * @since 1.0.11
       */
      public static void setDefaultBarPainter(XYBarPainter painter) {
          if (painter == null) {
              throw new IllegalArgumentException("Null 'painter' argument.");
          }
          XYBarRenderer.defaultBarPainter = painter;
      }
  
      /**
       * The default value for the initialisation of the shadowsVisible flag.
       */
      private static boolean defaultShadowsVisible = true;
  
      /**
       * Returns the default value for the <code>shadowsVisible</code> flag.
       *
       * @return A boolean.
       *
       * @see #setDefaultShadowsVisible(boolean)
       *
       * @since 1.0.13
       */
      public static boolean getDefaultShadowsVisible() {
          return XYBarRenderer.defaultShadowsVisible;
      }
  
      /**
       * Sets the default value for the shadows visible flag.
       *
       * @param visible  the new value for the default.
       *
       * @see #getDefaultShadowsVisible()
       *
       * @since 1.0.13
       */
      public static void setDefaultShadowsVisible(boolean visible) {
          XYBarRenderer.defaultShadowsVisible = visible;
      }
  
      /**
       * The state class used by this renderer.
       */
      protected class XYBarRendererState extends XYItemRendererState {
  
          /** Base for bars against the range axis, in Java 2D space. */
          private double g2Base;
  
          /**
           * Creates a new state object.
           *
           * @param info  the plot rendering info.
           */
          public XYBarRendererState(PlotRenderingInfo info) {
              super(info);
          }
  
          /**
           * Returns the base (range) value in Java 2D space.
           *
           * @return The base value.
           */
          public double getG2Base() {
              return this.g2Base;
          }
  
          /**
           * Sets the range axis base in Java2D space.
           *
           * @param value  the value.
           */
          public void setG2Base(double value) {
              this.g2Base = value;
          }
      }
  
      /** The default base value for the bars. */
      private double base;
  
      /**
       * A flag that controls whether the bars use the y-interval supplied by the
       * dataset.
       */
      private boolean useYInterval;
  
      /** Percentage margin (to reduce the width of bars). */
      private double margin;
  
      /** A flag that controls whether or not bar outlines are drawn. */
      private boolean drawBarOutline;
  
      /**
       * An optional class used to transform gradient paint objects to fit each
       * bar.
       */
      private GradientPaintTransformer gradientPaintTransformer;
  
      /**
       * The fallback position if a positive item label doesn't fit inside the
       * bar.
       */
      private ItemLabelPosition positiveItemLabelPositionFallback;
  
      /**
       * The fallback position if a negative item label doesn't fit inside the
       * bar.
       */
      private ItemLabelPosition negativeItemLabelPositionFallback;
  
      /**
       * The bar painter (never <code>null</code>).
       *
       * @since 1.0.11
       */
      private XYBarPainter barPainter;
  
      /**
       * The flag that controls whether or not shadows are drawn for the bars.
       *
       * @since 1.0.11
       */
      private boolean shadowsVisible;
  
      /**
       * The x-offset for the shadow effect.
       *
       * @since 1.0.11
       */
      private double shadowXOffset;
  
      /**
       * The y-offset for the shadow effect.
       *
       * @since 1.0.11
       */
      private double shadowYOffset;
  
      /**
       * A factor used to align the bars about the x-value.
       *
       * @since 1.0.13
       */
      private double barAlignmentFactor;
  
      /**
       * The default constructor.
       */
      public XYBarRenderer() {
          this(0.0);
      }
  
      /**
       * Constructs a new renderer.
       *
       * @param margin  the percentage amount to trim from the width of each bar.
       */
      public XYBarRenderer(double margin) {
          super();
          this.margin = margin;
          this.base = 0.0;
          this.useYInterval = false;
          this.gradientPaintTransformer = new StandardGradientPaintTransformer();
          this.drawBarOutline = false;
          setDefaultLegendShape(new Rectangle2D.Double(-3.0, -5.0, 6.0, 10.0));
          this.barPainter = getDefaultBarPainter();
          this.shadowsVisible = getDefaultShadowsVisible();
          this.shadowXOffset = 4.0;
          this.shadowYOffset = 4.0;
          this.barAlignmentFactor = -1.0;
      }
  
      /**
       * Returns the base value for the bars.
       *
       * @return The base value for the bars.
       *
       * @see #setBase(double)
       */
      public double getBase() {
          return this.base;
      }
  
      /**
       * Sets the base value for the bars and sends a {@link RendererChangeEvent}
       * to all registered listeners.  The base value is not used if the dataset's
       * y-interval is being used to determine the bar length.
       *
       * @param base  the new base value.
       *
       * @see #getBase()
       * @see #getUseYInterval()
       */
      public void setBase(double base) {
          this.base = base;
          fireChangeEvent();
      }
  
      /**
       * Returns a flag that determines whether the y-interval from the dataset is
       * used to calculate the length of each bar.
       *
       * @return A boolean.
       *
       * @see #setUseYInterval(boolean)
       */
      public boolean getUseYInterval() {
          return this.useYInterval;
      }
  
      /**
       * Sets the flag that determines whether the y-interval from the dataset is
       * used to calculate the length of each bar, and sends a
       * {@link RendererChangeEvent} to all registered listeners.
       *
       * @param use  the flag.
       *
       * @see #getUseYInterval()
       */
      public void setUseYInterval(boolean use) {
          if (this.useYInterval != use) {
              this.useYInterval = use;
              fireChangeEvent();
          }
      }
  
      /**
       * Returns the margin which is a percentage amount by which the bars are
       * trimmed.
       *
       * @return The margin.
       *
       * @see #setMargin(double)
       */
      public double getMargin() {
          return this.margin;
      }
  
      /**
       * Sets the percentage amount by which the bars are trimmed and sends a
       * {@link RendererChangeEvent} to all registered listeners.
       *
       * @param margin  the new margin.
       *
       * @see #getMargin()
       */
      public void setMargin(double margin) {
          this.margin = margin;
          fireChangeEvent();
      }
  
      /**
       * Returns a flag that controls whether or not bar outlines are drawn.
       *
       * @return A boolean.
       *
       * @see #setDrawBarOutline(boolean)
       */
      public boolean isDrawBarOutline() {
          return this.drawBarOutline;
      }
  
      /**
       * Sets the flag that controls whether or not bar outlines are drawn and
       * sends a {@link RendererChangeEvent} to all registered listeners.
       *
       * @param draw  the flag.
       *
       * @see #isDrawBarOutline()
       */
      public void setDrawBarOutline(boolean draw) {
          this.drawBarOutline = draw;
          fireChangeEvent();
      }
  
      /**
       * Returns the gradient paint transformer (an object used to transform
       * gradient paint objects to fit each bar).
       *
       * @return A transformer (<code>null</code> possible).
       *
       * @see #setGradientPaintTransformer(GradientPaintTransformer)
       */
      public GradientPaintTransformer getGradientPaintTransformer() {
          return this.gradientPaintTransformer;
      }
  
      /**
       * Sets the gradient paint transformer and sends a
       * {@link RendererChangeEvent} to all registered listeners.
       *
       * @param transformer  the transformer (<code>null</code> permitted).
       *
       * @see #getGradientPaintTransformer()
       */
      public void setGradientPaintTransformer(
              GradientPaintTransformer transformer) {
          this.gradientPaintTransformer = transformer;
          fireChangeEvent();
      }
  
      /**
       * Returns the fallback position for positive item labels that don't fit
       * within a bar.
       *
       * @return The fallback position (<code>null</code> possible).
       *
       * @see #setPositiveItemLabelPositionFallback(ItemLabelPosition)
       * @since 1.0.2
       */
      public ItemLabelPosition getPositiveItemLabelPositionFallback() {
          return this.positiveItemLabelPositionFallback;
      }
  
      /**
       * Sets the fallback position for positive item labels that don't fit
       * within a bar, and sends a {@link RendererChangeEvent} to all registered
       * listeners.
       *
       * @param position  the position (<code>null</code> permitted).
       *
       * @see #getPositiveItemLabelPositionFallback()
       * @since 1.0.2
       */
      public void setPositiveItemLabelPositionFallback(
              ItemLabelPosition position) {
          this.positiveItemLabelPositionFallback = position;
          fireChangeEvent();
      }
  
      /**
       * Returns the fallback position for negative item labels that don't fit
       * within a bar.
       *
       * @return The fallback position (<code>null</code> possible).
       *
       * @see #setNegativeItemLabelPositionFallback(ItemLabelPosition)
       * @since 1.0.2
       */
      public ItemLabelPosition getNegativeItemLabelPositionFallback() {
          return this.negativeItemLabelPositionFallback;
      }
  
      /**
       * Sets the fallback position for negative item labels that don't fit
       * within a bar, and sends a {@link RendererChangeEvent} to all registered
       * listeners.
       *
       * @param position  the position (<code>null</code> permitted).
       *
       * @see #getNegativeItemLabelPositionFallback()
       * @since 1.0.2
       */
      public void setNegativeItemLabelPositionFallback(
              ItemLabelPosition position) {
          this.negativeItemLabelPositionFallback = position;
          fireChangeEvent();
      }
  
      /**
       * Returns the bar painter.
       *
       * @return The bar painter (never <code>null</code>).
       *
       * @since 1.0.11
       */
      public XYBarPainter getBarPainter() {
          return this.barPainter;
      }
  
      /**
       * Sets the bar painter and sends a {@link RendererChangeEvent} to all
       * registered listeners.
       *
       * @param painter  the painter (<code>null</code> not permitted).
       *
       * @since 1.0.11
       */
      public void setBarPainter(XYBarPainter painter) {
          if (painter == null) {
              throw new IllegalArgumentException("Null 'painter' argument.");
          }
          this.barPainter = painter;
          fireChangeEvent();
      }
  
      /**
       * Returns the flag that controls whether or not shadows are drawn for
       * the bars.
       *
       * @return A boolean.
       *
       * @since 1.0.11
       */
      public boolean getShadowsVisible() {
          return this.shadowsVisible;
      }
  
      /**
       * Sets the flag that controls whether or not the renderer
       * draws shadows for the bars, and sends a
       * {@link RendererChangeEvent} to all registered listeners.
       *
       * @param visible  the new flag value.
       *
       * @since 1.0.11
       */
      public void setShadowVisible(boolean visible) {
          this.shadowsVisible = visible;
          fireChangeEvent();
      }
  
      /**
       * Returns the shadow x-offset.
       *
       * @return The shadow x-offset.
       *
       * @since 1.0.11
       */
      public double getShadowXOffset() {
          return this.shadowXOffset;
      }
  
      /**
       * Sets the x-offset for the bar shadow and sends a
       * {@link RendererChangeEvent} to all registered listeners.
       *
       * @param offset  the offset.
       *
       * @since 1.0.11
       */
      public void setShadowXOffset(double offset) {
          this.shadowXOffset = offset;
          fireChangeEvent();
      }
  
      /**
       * Returns the shadow y-offset.
       *
       * @return The shadow y-offset.
       *
       * @since 1.0.11
       */
      public double getShadowYOffset() {
          return this.shadowYOffset;
      }
  
      /**
       * Sets the y-offset for the bar shadow and sends a
       * {@link RendererChangeEvent} to all registered listeners.
       *
       * @param offset  the offset.
       *
       * @since 1.0.11
       */
      public void setShadowYOffset(double offset) {
          this.shadowYOffset = offset;
          fireChangeEvent();
      }
  
      /**
       * Returns the bar alignment factor.
       *
       * @return The bar alignment factor.
       *
       * @since 1.0.13
       */
      public double getBarAlignmentFactor() {
          return this.barAlignmentFactor;
      }
  
      /**
       * Sets the bar alignment factor and sends a {@link RendererChangeEvent}
       * to all registered listeners.  If the alignment factor is outside the
       * range 0.0 to 1.0, no alignment will be performed by the renderer.
       *
       * @param factor  the factor.
       *
       * @since 1.0.13
       */
      public void setBarAlignmentFactor(double factor) {
          this.barAlignmentFactor = factor;
          fireChangeEvent();
      }
  
      /**
       * Initialises the renderer and returns a state object that should be
       * passed to all subsequent calls to the drawItem() method.  Here we
       * calculate the Java2D y-coordinate for zero, since all the bars have
       * their bases fixed at zero.
       *
       * @param g2  the graphics device.
       * @param dataArea  the area inside the axes.
       * @param plot  the plot.
       * @param dataset  the data.
       * @param info  an optional info collection object to return data back to
       *              the caller.
       *
       * @return A state object.
       */
      @Override
      public XYItemRendererState initialise(Graphics2D g2, Rectangle2D dataArea,
              XYPlot plot, XYDataset dataset, PlotRenderingInfo info) {
  
          XYBarRendererState state = new XYBarRendererState(info);
          ValueAxis rangeAxis = plot.getRangeAxisForDataset(plot.indexOf(
                  dataset));
          state.setG2Base(rangeAxis.valueToJava2D(this.base, dataArea,
                  plot.getRangeAxisEdge()));
          return state;
  
      }
  
      /**
       * Returns a default legend item for the specified series.  Subclasses
       * should override this method to generate customised items.
       *
       * @param datasetIndex  the dataset index (zero-based).
       * @param series  the series index (zero-based).
       *
       * @return A legend item for the series.
       */
      @Override
      public LegendItem getLegendItem(int datasetIndex, int series) {
          XYPlot xyplot = getPlot();
          if (xyplot == null) {
              return null;
          }
          XYDataset dataset = xyplot.getDataset(datasetIndex);
          if (dataset == null) {
              return null;
          }
          LegendItem result = null;
          XYSeriesLabelGenerator lg = getLegendItemLabelGenerator();
          String label = lg.generateLabel(dataset, series);
          String description = label;
          String toolTipText = null;
          if (getLegendItemToolTipGenerator() != null) {
              toolTipText = getLegendItemToolTipGenerator().generateLabel(
                      dataset, series);
          }
          String urlText = null;
          if (getLegendItemURLGenerator() != null) {
              urlText = getLegendItemURLGenerator().generateLabel(dataset,
                      series);
          }
          Shape shape = this.lookupLegendShape(series);
          Paint paint = lookupSeriesPaint(series);
          Paint outlinePaint = lookupSeriesOutlinePaint(series);
          Stroke outlineStroke = lookupSeriesOutlineStroke(series);
          if (this.drawBarOutline) {
              result = new LegendItem(label, description, toolTipText,
                      urlText, shape, paint, outlineStroke, outlinePaint);
          }
          else {
              result = new LegendItem(label, description, toolTipText, urlText,
                      shape, paint);
          }
          result.setLabelFont(lookupLegendTextFont(series));
          Paint labelPaint = lookupLegendTextPaint(series);
          if (labelPaint != null) {
              result.setLabelPaint(labelPaint);
          }
          result.setDataset(dataset);
          result.setDatasetIndex(datasetIndex);
          result.setSeriesKey(dataset.getSeriesKey(series));
          result.setSeriesIndex(series);
          if (getGradientPaintTransformer() != null) {
              result.setFillPaintTransformer(getGradientPaintTransformer());
          }
          return result;
      }
  
      /**
       * Draws the visual representation of a single data item.
       *
       * @param g2  the graphics device.
       * @param state  the renderer state.
       * @param dataArea  the area within which the plot is being drawn.
       * @param info  collects information about the drawing.
       * @param plot  the plot (can be used to obtain standard color
       *              information etc).
       * @param domainAxis  the domain axis.
       * @param rangeAxis  the range axis.
       * @param dataset  the dataset.
       * @param series  the series index (zero-based).
       * @param item  the item index (zero-based).
       * @param crosshairState  crosshair information for the plot
       *                        (<code>null</code> permitted).
       * @param pass  the pass index.
       */
      @Override
      public void drawItem(Graphics2D g2,
                           XYItemRendererState state,
                           Rectangle2D dataArea,
                           PlotRenderingInfo info,
                           XYPlot plot,
                           ValueAxis domainAxis,
                           ValueAxis rangeAxis,
                           XYDataset dataset,
                           int series,
                           int item,
                           CrosshairState crosshairState,
                           int pass) {
  
          if (!getItemVisible(series, item)) {
              return;
          }
          IntervalXYDataset intervalDataset = (IntervalXYDataset) dataset;
  
          double value0;
          double value1;
          if (this.useYInterval) {
              value0 = intervalDataset.getStartYValue(series, item);
              value1 = intervalDataset.getEndYValue(series, item);
          }
          else {
              value0 = this.base;
              value1 = intervalDataset.getYValue(series, item);
          }
          if (Double.isNaN(value0) || Double.isNaN(value1)) {
              return;
          }
          if (value0 <= value1) {
              if (!rangeAxis.getRange().intersects(value0, value1)) {
                  return;
              }
          }
          else {
              if (!rangeAxis.getRange().intersects(value1, value0)) {
                  return;
              }
          }
  
          double translatedValue0 = rangeAxis.valueToJava2D(value0, dataArea,
                  plot.getRangeAxisEdge());
          double translatedValue1 = rangeAxis.valueToJava2D(value1, dataArea,
                  plot.getRangeAxisEdge());
          double bottom = Math.min(translatedValue0, translatedValue1);
          double top = Math.max(translatedValue0, translatedValue1);
  
          double startX = intervalDataset.getStartXValue(series, item);
          if (Double.isNaN(startX)) {
              return;
          }
          double endX = intervalDataset.getEndXValue(series, item);
          if (Double.isNaN(endX)) {
              return;
          }
          if (startX <= endX) {
              if (!domainAxis.getRange().intersects(startX, endX)) {
                  return;
              }
          }
          else {
              if (!domainAxis.getRange().intersects(endX, startX)) {
                  return;
              }
          }
  
          // is there an alignment adjustment to be made?
          if (this.barAlignmentFactor >= 0.0 && this.barAlignmentFactor <= 1.0) {
              double x = intervalDataset.getXValue(series, item);
              double interval = endX - startX;
              startX = x - interval * this.barAlignmentFactor;
              endX = startX + interval;
          }
  
          RectangleEdge location = plot.getDomainAxisEdge();
          double translatedStartX = domainAxis.valueToJava2D(startX, dataArea,
                  location);
          double translatedEndX = domainAxis.valueToJava2D(endX, dataArea,
                  location);
  
          double translatedWidth = Math.max(1, Math.abs(translatedEndX
                  - translatedStartX));
  
          double left = Math.min(translatedStartX, translatedEndX);
          if (getMargin() > 0.0) {
              double cut = translatedWidth * getMargin();
              translatedWidth = translatedWidth - cut;
              left = left + cut / 2;
          }
  
          Rectangle2D bar = null;
          PlotOrientation orientation = plot.getOrientation();
          if (orientation == PlotOrientation.HORIZONTAL) {
              // clip left and right bounds to data area
              bottom = Math.max(bottom, dataArea.getMinX());
              top = Math.min(top, dataArea.getMaxX());
              bar = new Rectangle2D.Double(
                  bottom, left, top - bottom, translatedWidth);
          }
          else if (orientation == PlotOrientation.VERTICAL) {
              // clip top and bottom bounds to data area
              bottom = Math.max(bottom, dataArea.getMinY());
              top = Math.min(top, dataArea.getMaxY());
              bar = new Rectangle2D.Double(left, bottom, translatedWidth,
                      top - bottom);
          }
  
          boolean positive = (value1 > 0.0);
          boolean inverted = rangeAxis.isInverted();
          RectangleEdge barBase;
          if (orientation == PlotOrientation.HORIZONTAL) {
              if (positive && inverted || !positive && !inverted) {
                  barBase = RectangleEdge.RIGHT;
              }
              else {
                  barBase = RectangleEdge.LEFT;
              }
          }
          else {
              if (positive && !inverted || !positive && inverted) {
                  barBase = RectangleEdge.BOTTOM;
              }
              else {
                  barBase = RectangleEdge.TOP;
              }
          }
          if (getShadowsVisible()) {
              this.barPainter.paintBarShadow(g2, this, series, item, bar, barBase,
                  !this.useYInterval);
          }
          this.barPainter.paintBar(g2, this, series, item, bar, barBase);
  
          if (isItemLabelVisible(series, item)) {
              XYItemLabelGenerator generator = getItemLabelGenerator(series,
                      item);
              drawItemLabel(g2, dataset, series, item, plot, generator, bar,
                      value1 < 0.0);
          }
  
          // update the crosshair point
          double x1 = (startX + endX) / 2.0;
          double y1 = dataset.getYValue(series, item);
          double transX1 = domainAxis.valueToJava2D(x1, dataArea, location);
          double transY1 = rangeAxis.valueToJava2D(y1, dataArea,
                  plot.getRangeAxisEdge());
          int domainAxisIndex = plot.getDomainAxisIndex(domainAxis);
          int rangeAxisIndex = plot.getRangeAxisIndex(rangeAxis);
          updateCrosshairValues(crosshairState, x1, y1, domainAxisIndex,
                  rangeAxisIndex, transX1, transY1, plot.getOrientation());
  
          EntityCollection entities = state.getEntityCollection();
          if (entities != null) {
              addEntity(entities, bar, dataset, series, item, 0.0, 0.0);
          }
  
      }
  
      /**
       * Draws an item label.  This method is provided as an alternative to
       * {@link #drawItemLabel(Graphics2D, PlotOrientation, XYDataset, int, int,
       * double, double, boolean)} so that the bar can be used to calculate the
       * label anchor point.
       *
       * @param g2  the graphics device.
       * @param dataset  the dataset.
       * @param series  the series index.
       * @param item  the item index.
       * @param plot  the plot.
       * @param generator  the label generator (<code>null</code> permitted, in
       *         which case the method does nothing, just returns).
       * @param bar  the bar.
       * @param negative  a flag indicating a negative value.
       */
      protected void drawItemLabel(Graphics2D g2, XYDataset dataset,
              int series, int item, XYPlot plot, XYItemLabelGenerator generator,
              Rectangle2D bar, boolean negative) {
  
          if (generator == null) {
              return;  // nothing to do
          }
          String label = generator.generateLabel(dataset, series, item);
          if (label == null) {
              return;  // nothing to do
          }
  
          Font labelFont = getItemLabelFont(series, item);
          g2.setFont(labelFont);
          Paint paint = getItemLabelPaint(series, item);
          g2.setPaint(paint);
  
          // find out where to place the label...
          ItemLabelPosition position = null;
          if (!negative) {
              position = getPositiveItemLabelPosition(series, item);
          }
          else {
              position = getNegativeItemLabelPosition(series, item);
          }
  
          // work out the label anchor point...
          Point2D anchorPoint = calculateLabelAnchorPoint(
                  position.getItemLabelAnchor(), bar, plot.getOrientation());
  
          if (isInternalAnchor(position.getItemLabelAnchor())) {
              Shape bounds = TextUtilities.calculateRotatedStringBounds(label,
                      g2, (float) anchorPoint.getX(), (float) anchorPoint.getY(),
                      position.getTextAnchor(), position.getAngle(),
                      position.getRotationAnchor());
  
              if (bounds != null) {
                  if (!bar.contains(bounds.getBounds2D())) {
                      if (!negative) {
                          position = getPositiveItemLabelPositionFallback();
                      }
                      else {
                          position = getNegativeItemLabelPositionFallback();
                      }
                      if (position != null) {
                          anchorPoint = calculateLabelAnchorPoint(
                                  position.getItemLabelAnchor(), bar,
                                  plot.getOrientation());
                      }
                  }
              }
  
          }
  
          if (position != null) {
              TextUtilities.drawRotatedString(label, g2,
                      (float) anchorPoint.getX(), (float) anchorPoint.getY(),
                      position.getTextAnchor(), position.getAngle(),
                      position.getRotationAnchor());
          }
      }
  
      /**
       * Calculates the item label anchor point.
       *
       * @param anchor  the anchor.
       * @param bar  the bar.
       * @param orientation  the plot orientation.
       *
       * @return The anchor point.
       */
      private Point2D calculateLabelAnchorPoint(ItemLabelAnchor anchor,
              Rectangle2D bar, PlotOrientation orientation) {
  
          Point2D result = null;
          double offset = getItemLabelAnchorOffset();
          double x0 = bar.getX() - offset;
          double x1 = bar.getX();
          double x2 = bar.getX() + offset;
          double x3 = bar.getCenterX();
          double x4 = bar.getMaxX() - offset;
          double x5 = bar.getMaxX();
          double x6 = bar.getMaxX() + offset;
  
          double y0 = bar.getMaxY() + offset;
          double y1 = bar.getMaxY();
          double y2 = bar.getMaxY() - offset;
          double y3 = bar.getCenterY();
          double y4 = bar.getMinY() + offset;
          double y5 = bar.getMinY();
          double y6 = bar.getMinY() - offset;
  
          if (anchor == ItemLabelAnchor.CENTER) {
              result = new Point2D.Double(x3, y3);
          }
          else if (anchor == ItemLabelAnchor.INSIDE1) {
              result = new Point2D.Double(x4, y4);
          }
          else if (anchor == ItemLabelAnchor.INSIDE2) {
              result = new Point2D.Double(x4, y4);
          }
          else if (anchor == ItemLabelAnchor.INSIDE3) {
              result = new Point2D.Double(x4, y3);
          }
          else if (anchor == ItemLabelAnchor.INSIDE4) {
              result = new Point2D.Double(x4, y2);
          }
          else if (anchor == ItemLabelAnchor.INSIDE5) {
              result = new Point2D.Double(x4, y2);
          }
          else if (anchor == ItemLabelAnchor.INSIDE6) {
              result = new Point2D.Double(x3, y2);
          }
          else if (anchor == ItemLabelAnchor.INSIDE7) {
              result = new Point2D.Double(x2, y2);
          }
          else if (anchor == ItemLabelAnchor.INSIDE8) {
              result = new Point2D.Double(x2, y2);
          }
          else if (anchor == ItemLabelAnchor.INSIDE9) {
              result = new Point2D.Double(x2, y3);
          }
          else if (anchor == ItemLabelAnchor.INSIDE10) {
              result = new Point2D.Double(x2, y4);
          }
          else if (anchor == ItemLabelAnchor.INSIDE11) {
              result = new Point2D.Double(x2, y4);
          }
          else if (anchor == ItemLabelAnchor.INSIDE12) {
              result = new Point2D.Double(x3, y4);
          }
          else if (anchor == ItemLabelAnchor.OUTSIDE1) {
              result = new Point2D.Double(x5, y6);
          }
          else if (anchor == ItemLabelAnchor.OUTSIDE2) {
              result = new Point2D.Double(x6, y5);
          }
          else if (anchor == ItemLabelAnchor.OUTSIDE3) {
              result = new Point2D.Double(x6, y3);
          }
          else if (anchor == ItemLabelAnchor.OUTSIDE4) {
              result = new Point2D.Double(x6, y1);
          }
          else if (anchor == ItemLabelAnchor.OUTSIDE5) {
              result = new Point2D.Double(x5, y0);
          }
          else if (anchor == ItemLabelAnchor.OUTSIDE6) {
              result = new Point2D.Double(x3, y0);
          }
          else if (anchor == ItemLabelAnchor.OUTSIDE7) {
              result = new Point2D.Double(x1, y0);
          }
          else if (anchor == ItemLabelAnchor.OUTSIDE8) {
              result = new Point2D.Double(x0, y1);
          }
          else if (anchor == ItemLabelAnchor.OUTSIDE9) {
              result = new Point2D.Double(x0, y3);
          }
          else if (anchor == ItemLabelAnchor.OUTSIDE10) {
              result = new Point2D.Double(x0, y5);
          }
          else if (anchor == ItemLabelAnchor.OUTSIDE11) {
              result = new Point2D.Double(x1, y6);
          }
          else if (anchor == ItemLabelAnchor.OUTSIDE12) {
              result = new Point2D.Double(x3, y6);
          }
  
          return result;
  
      }
  
      /**
       * Returns <code>true</code> if the specified anchor point is inside a bar.
       *
       * @param anchor  the anchor point.
       *
       * @return A boolean.
       */
      private boolean isInternalAnchor(ItemLabelAnchor anchor) {
          return anchor == ItemLabelAnchor.CENTER
                 || anchor == ItemLabelAnchor.INSIDE1
                 || anchor == ItemLabelAnchor.INSIDE2
                 || anchor == ItemLabelAnchor.INSIDE3
                 || anchor == ItemLabelAnchor.INSIDE4
                 || anchor == ItemLabelAnchor.INSIDE5
                 || anchor == ItemLabelAnchor.INSIDE6
                 || anchor == ItemLabelAnchor.INSIDE7
                 || anchor == ItemLabelAnchor.INSIDE8
                 || anchor == ItemLabelAnchor.INSIDE9
                 || anchor == ItemLabelAnchor.INSIDE10
                 || anchor == ItemLabelAnchor.INSIDE11
                 || anchor == ItemLabelAnchor.INSIDE12;
      }
  
      /**
       * Returns the lower and upper bounds (range) of the x-values in the
       * specified dataset.  Since this renderer uses the x-interval in the
       * dataset, this is taken into account for the range.
       *
       * @param dataset  the dataset (<code>null</code> permitted).
       *
       * @return The range (<code>null</code> if the dataset is
       *         <code>null</code> or empty).
       */
      @Override
      public Range findDomainBounds(XYDataset dataset) {
          return findDomainBounds(dataset, true);
      }
  
      /**
       * Returns the lower and upper bounds (range) of the y-values in the
       * specified dataset.  If the renderer is plotting the y-interval from the
       * dataset, this is taken into account for the range.
       *
       * @param dataset  the dataset (<code>null</code> permitted).
       *
       * @return The range (<code>null</code> if the dataset is
       *         <code>null</code> or empty).
       */
      @Override
      public Range findRangeBounds(XYDataset dataset) {
          return findRangeBounds(dataset, this.useYInterval);
      }
  
      /**
       * Returns a clone of the renderer.
       *
       * @return A clone.
       *
       * @throws CloneNotSupportedException  if the renderer cannot be cloned.
       */
      @Override
      public Object clone() throws CloneNotSupportedException {
          XYBarRenderer result = (XYBarRenderer) super.clone();
          if (this.gradientPaintTransformer != null) {
              result.gradientPaintTransformer = ObjectUtilities.clone(this.gradientPaintTransformer);
          }
          return result;
      }
  
      /**
       * Tests this renderer for equality with an arbitrary object.
       *
       * @param obj  the object to test against (<code>null</code> permitted).
       *
       * @return A boolean.
       */
      @Override
      public boolean equals(Object obj) {
          if (obj == this) {
              return true;
          }
          if (!(obj instanceof XYBarRenderer)) {
              return false;
          }
          XYBarRenderer that = (XYBarRenderer) obj;
          if (this.base != that.base) {
              return false;
          }
          if (this.drawBarOutline != that.drawBarOutline) {
              return false;
          }
          if (this.margin != that.margin) {
              return false;
          }
          if (this.useYInterval != that.useYInterval) {
              return false;
          }
          if (!ObjectUtilities.equal(this.gradientPaintTransformer,
                  that.gradientPaintTransformer)) {
              return false;
          }
          if (!ObjectUtilities.equal(this.positiveItemLabelPositionFallback,
                  that.positiveItemLabelPositionFallback)) {
              return false;
          }
          if (!ObjectUtilities.equal(this.negativeItemLabelPositionFallback,
                  that.negativeItemLabelPositionFallback)) {
              return false;
          }
          if (!this.barPainter.equals(that.barPainter)) {
              return false;
          }
          if (this.shadowsVisible != that.shadowsVisible) {
              return false;
          }
          if (this.shadowXOffset != that.shadowXOffset) {
              return false;
          }
          if (this.shadowYOffset != that.shadowYOffset) {
              return false;
          }
          if (this.barAlignmentFactor != that.barAlignmentFactor) {
              return false;
          }
          return super.equals(obj);
      }
  
  }
  